ETFs Are Reducing Market Efficiency By: TalkMarkets April 20, 2017 at 15:04 PM EDT A single percentage point increase in ETF ownership of a stock, leads to a 9% increase in correlation between the ETF and share’s industry group and the broader market. Read More >> Related Stocks: Dow Industrials SPDR Mid Cap SPDR 400 Trust, Series 1 Russell 1000 Growth Ishares ETF Russell 1000 Value Ishares ETF Russell 2000 Ishares ETF S&P 500 ETF Vanguard S&P 500 Ishares Core ETF S&P Midcap 400 Ishares Core ETF SPDR S&P 500 ETF Trust Total Stock Market ETF Vanguard